Matches in SemOpenAlex for { <https://semopenalex.org/work/W2351165560> ?p ?o ?g. }
Showing items 1 to 69 of
69
with 100 items per page.
- W2351165560 abstract "Hafnium and zirconium can promote the formation of(γ+γ′) eutectic,MC_((2)) carbides,M_2SC sulfides and Ni_5M phases in superalloys,change script MC and M_3B_2 into blocky shape and delay the initiation and propagation of cracks by cleaning the free state sulfur at grain boundary and interdendritic regions and strengthening their cohesion.Both of elements Hf and Zr increase the stress rupture strength and ductility of cast superalloys at intermediate temperature and also improve the tensile strength and ductility at room temperature.Hf and Zr strict the precipitation of secondary carbides,such as M_(23)C_6 and M_6C,therefore stabilize the microstructure of alloys during long-term exposure at elevated temperature.However,Hf and Zr lower the incipient melting temperature of superalloys.The melting of Ni_5Hf or Ni_5Zr phases may be considered as one of the main factors affecting incipient melting.By means of a pretreatment at 1150℃/8h,Ni_5Hf phase can be eliminated in two ways: The reaction Ni_5Hf+ γ(C) →MC_((2))+ γ or solid solution.Hafnium may narrow down the range between temperature lost the interdendritic capillary feeding action and solidus,as well as may decrease the liquid content necessary for linking the interdendritic pools in the late solidification.The Hf-rich melts in interdendritic zone have superior fluidity,wettability and skin effect.These are the factors in increasing castability and weldability of Hf-containing superalloys and in decreasing tendency of hot tear.The high chemical activity of skin Hf-rich liquid promotes the formation of a thin layer of Hf_2O on the surface of castings.Hf and Zr are the melting point depressant in the interlayer alloys used for brazing.It may be considered that dendrites formed in the early solidification are brazed by interdendritic Hfor Zr-rich melts.Eventually,the Ni-18.6Co-4.5Cr-4.7W-25.6Hf and Ni-10Co-8Cr-4W-13Zr alloys were developed according to the composition of Hf-or Zr-rich melts,and the Si-or B-free-bonding for single crystal superalloys could be realized.Studying the Hf-rich melts also leads to the development of unidirectionally solidified lamellar Ni_3Al/Ni_7Hf_2 eutectic.The suitable compositions for these eutectic in situ composites are Ni-5.8Al-32Hf and Ni-4Al-26Hf-8Cr-4W.The results showed that the lamellar Ni_3Al/Ni_7Hf_2 eutectic aligned parallel to the direction of solidification were prepared with temparature gradient G=250℃·cm~(-1) and solidification rate R=5μm·s~(-1) for the ternary alloy,and G=350℃·cm~(-1) and R=1μm·s~(1) for multicomponent alloy." @default.
- W2351165560 created "2016-06-24" @default.
- W2351165560 creator A5080293231 @default.
- W2351165560 date "2006-01-01" @default.
- W2351165560 modified "2023-09-28" @default.
- W2351165560 title "Investigation of Effect Mechanism of Hafnium and Zirconium in High Temperature Materials" @default.
- W2351165560 hasPublicationYear "2006" @default.
- W2351165560 type Work @default.
- W2351165560 sameAs 2351165560 @default.
- W2351165560 citedByCount "0" @default.
- W2351165560 crossrefType "journal-article" @default.
- W2351165560 hasAuthorship W2351165560A5080293231 @default.
- W2351165560 hasConcept C121332964 @default.
- W2351165560 hasConcept C149912024 @default.
- W2351165560 hasConcept C153294291 @default.
- W2351165560 hasConcept C18168003 @default.
- W2351165560 hasConcept C191897082 @default.
- W2351165560 hasConcept C192562407 @default.
- W2351165560 hasConcept C207055975 @default.
- W2351165560 hasConcept C23693375 @default.
- W2351165560 hasConcept C2776512210 @default.
- W2351165560 hasConcept C2780026712 @default.
- W2351165560 hasConcept C39353612 @default.
- W2351165560 hasConcept C47908070 @default.
- W2351165560 hasConcept C5335593 @default.
- W2351165560 hasConcept C534791751 @default.
- W2351165560 hasConcept C546638069 @default.
- W2351165560 hasConcept C87976508 @default.
- W2351165560 hasConceptScore W2351165560C121332964 @default.
- W2351165560 hasConceptScore W2351165560C149912024 @default.
- W2351165560 hasConceptScore W2351165560C153294291 @default.
- W2351165560 hasConceptScore W2351165560C18168003 @default.
- W2351165560 hasConceptScore W2351165560C191897082 @default.
- W2351165560 hasConceptScore W2351165560C192562407 @default.
- W2351165560 hasConceptScore W2351165560C207055975 @default.
- W2351165560 hasConceptScore W2351165560C23693375 @default.
- W2351165560 hasConceptScore W2351165560C2776512210 @default.
- W2351165560 hasConceptScore W2351165560C2780026712 @default.
- W2351165560 hasConceptScore W2351165560C39353612 @default.
- W2351165560 hasConceptScore W2351165560C47908070 @default.
- W2351165560 hasConceptScore W2351165560C5335593 @default.
- W2351165560 hasConceptScore W2351165560C534791751 @default.
- W2351165560 hasConceptScore W2351165560C546638069 @default.
- W2351165560 hasConceptScore W2351165560C87976508 @default.
- W2351165560 hasOpenAccess W2351165560 @default.
- W2351165560 hasRelatedWork W1833981073 @default.
- W2351165560 hasRelatedWork W1973784805 @default.
- W2351165560 hasRelatedWork W1990706013 @default.
- W2351165560 hasRelatedWork W1991287547 @default.
- W2351165560 hasRelatedWork W2037621621 @default.
- W2351165560 hasRelatedWork W2074305435 @default.
- W2351165560 hasRelatedWork W2338319163 @default.
- W2351165560 hasRelatedWork W2354152286 @default.
- W2351165560 hasRelatedWork W2375632731 @default.
- W2351165560 hasRelatedWork W2786234354 @default.
- W2351165560 hasRelatedWork W2888272673 @default.
- W2351165560 hasRelatedWork W2923625468 @default.
- W2351165560 hasRelatedWork W2928689952 @default.
- W2351165560 hasRelatedWork W3012801466 @default.
- W2351165560 hasRelatedWork W3101643770 @default.
- W2351165560 hasRelatedWork W3128839118 @default.
- W2351165560 hasRelatedWork W3135190917 @default.
- W2351165560 hasRelatedWork W3145585240 @default.
- W2351165560 hasRelatedWork W3147385594 @default.
- W2351165560 hasRelatedWork W3201314532 @default.
- W2351165560 isParatext "false" @default.
- W2351165560 isRetracted "false" @default.
- W2351165560 magId "2351165560" @default.
- W2351165560 workType "article" @default.